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Stop a a convenience store or gas station and pick up about 30 pounds of ice. Dump it down the toilet and drive away. Supposedly the sloshing action of the ice cubes on the inside will clean the sensors. I have never done it, but have read about it in the 101 tips for RVing book.
Also, some one here posted that they put lock washers on the sensors and it helped. Don't know the details on that one.
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